The original labradorite was found in the neighbourhood of Nain, notably in a lagoon about 50 m.
The term labradorite is unfortunately used also as a rock-name, having been applied by Fouque and Levy to a group of basic rocks rich in augite and poor in olivine.
Ejected crystals of labradoriteare found on Monti Rossi, a double parasitic cone on Etna.
Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by petrologists.
It has the usual twinning characteristic of plagioclase and belongs to the andesine-labradorite series, extinction angles proving basic andesine and acid labradorite to be the most common.
Basalt, a lava consisting essentially of augite, labradorite (or nepheline) and magnetic iron-ore is the rock which predominates in this formation.
The labradorite contains inclusions of rutile and biotite and has a well-developed wedge structure and cross fracture due to the pressure and shearing which it has undergone.
The waters were deep and black, the shores were steep and rocky, and some labradorite was seen.
A coarse grained rock of dark gray color, in which labradorite is the chief mineral.
They give lamellar extinctions varying from those of medium andesine to acid labradorite (15-30°).
They contain inclusions of the magma and give lamellar extinctions of andesine labradorite (20°-30°).
They are corroded and give extinctions of acid labradorite (26-32°).
The small plagioclase phenocrysts, which are fairly numerous, give lamellar extinctions of andesine labradorite (20 to 30°).
Essentially it is a crystalline-granular compound of plagioclase, generally Labradorite and diallage.
One of the varieties is the same as the apolescent labradorite rock of Labrador.
Labradorite series north of the river St. Lawrence in Canada.
The labradorite exhibiting the latter property in the most remarkable degree and hence most valued is that found on the coast of Labrador near Nain and the adjacent island of St. Paul.
This differs in composition from amazonstone in containing soda and lime in place of potash, the percentages in a typical labradorite being, silica 53.
These lying in parallel position in great numbers in the labradorite give the colors.
The labradorite of the latter locality is the better, its occurrence being in a coarse-grained gabbro.
Excellent effects are sometimes produced in labradorite by cutting it in the form of cameos so as to make the base of different color from the figure in relief.
Labradorite is a common rock-forming mineral, especially in the older rocks.
Bauer mentions a labradorite from Russia the colored portions of which formed a striking likeness of Louis XVI, the head being a beautiful blue against a gold green background, while above appeared a beautiful garnet red crown.
Like labradorite the sheen is visible only when the stone is held at a certain angle.
The play of colors seen in labradorite is not like that of the opal, which presents to the eye fragments of different colors varying in different positions, but appears as broad surfaces of a single color.
Like labradorite it usually exhibits on the surface of easiest cleavage parallel striations due to twinning structure.
Labradorite has the typical cleavage of Feldspar and cleavage surfaces in the direction of easiest cleavage are usually marked by rows of parallel striae.
Labradorite of pleasing color and opalescence occurs in a few other localities in Canada, and in Essex county, New York, in the United States.
Of the different colors shown by labradorite blue and green are the most common, yellow and red least so.
The plagioclase in diorite is mainly the more acidic species, like oligoclase; while in norite the more basic species, such as labradorite and anorthite, predominate.
Hypersthene rock' is a granular mixture of labradoriteand hypersthene.
The tea was still infusing when she had determined upon an enormous paper-weight of that iridescent Labradorite that had been so astonishing a feature of the Green River Valley.
Rose was the first to prove that the lavas of Etna do not contain ordinary felspar (or potash felspar), but labradorite (or lime felspar.
Von Waltershausen gives the following as the composition of two specimens of Labradoritefrom Etna:-- I.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "labradorite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
